DE217730C - - Google Patents
Info
- Publication number
- DE217730C DE217730C DENDAT217730D DE217730DA DE217730C DE 217730 C DE217730 C DE 217730C DE NDAT217730 D DENDAT217730 D DE NDAT217730D DE 217730D A DE217730D A DE 217730DA DE 217730 C DE217730 C DE 217730C
- Authority
- DE
- Germany
- Prior art keywords
- relay
- line
- switch
- circuit
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 description 2
- 230000000903 blocking Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 210000000056 organs Anatomy 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
- H04M1/70—Lock-out or secrecy arrangements in party-line systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE217730C true DE217730C (es) |
Family
ID=479017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT217730D Active DE217730C (es) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE217730C (es) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5884536A (en) * | 1997-02-27 | 1999-03-23 | Durant; Raymond J. | Valve packing extractor and valve gland cleaner |
-
0
- DE DENDAT217730D patent/DE217730C/de active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5884536A (en) * | 1997-02-27 | 1999-03-23 | Durant; Raymond J. | Valve packing extractor and valve gland cleaner |
| US6032554A (en) * | 1997-02-27 | 2000-03-07 | Durant; Raymond J. | Valve packing extractor and valve gland cleaner |
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